Hi Linda
Thats a huge wide open question....
Probably why no one has tackled it...
Please Be more specific
Depends on the software you are using
Apple themselves are pretty good with Security these days.
Turn on your built in FireWall in System settings / security & Privacy
Whereas Google & FaceBook & Android phones aren't...
They are information gatherer's. Thats how they pay the bills.
Cheers
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